code: def _py_not(a):
      """Default Python implementation of the "not_" operator."""
      return not a
  
file_path: DALI/dali/python/nvidia/dali/_autograph/operators/logical.py
imports: from nvidia.dali._autograph.utils import hooks
label_desc: Use image node_id 2 for calling a global function with example usage: _py_not(a) and returns: unknown